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RISS 인기검색어
- 검색키워드
- 저자 : Kazusato Ohshima (검색결과 3 건)
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Seo, Jang-Kyun,Ohshima, Kazusato,Lee, Hyeok-Geun,Son, Moonil,Choi, Hong-Soo,Lee, Su-Heon,Sohn, Seong-Han,Kim, Kook-Hyung Elsevier 2009 Virology Vol.393 No.1
<P><B>Abstract</B></P><P>The complete genomes of 30 <I>Soybean mosaic virus</I> (SMV) isolates and strains were sequenced in this study. Together with fourteen previously reported sequences, we analyzed the genetic structure of the SMV population. Analyses of genetic diversity showed that different genomic regions of SMV are under different evolutionary constraints and that there was no significant genetic differentiation between East Asian and North American populations of SMV. Phylogenetic analyses revealed a significant correlation between phylogeny of the cylindrical inclusion (CI) gene of SMV and SMV resistance gene 3 (<I>Rsv3</I>)-relating pathogenicity of SMV, suggesting CI might be a pathogenic determinant in <I>Rsv3</I>-mediated disease response. Interestingly, recombination analyses identified 19 ‘clear’ recombination events in the SMV population. Furthermore, as several resistance-breaking strains were identified as recombinants, it appears that recombination might contribute to overcome host resistance in SMV–soybean pathosystem. Our finding suggests that recombination as well as mutation is an important evolutionary process in the genetic diversification of SMV population.</P>
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Pourrahim, Reza,Golnaraghi, Alireza,Farzadfar, Shirin,Ohshima, Kazusato The Korean Society of Plant Pathology 2012 Plant Pathology Journal Vol.28 No.4
Eight potato-producing provinces of Iran were surveyed during the growing seasons of 2004-2006 to detect the presence of Tomato yellow fruit ring virus (TYFRV), a tentative species in the genus Tospovirus. A total of 1,957 potato leaf samples were collected from plants with tospovirus-like symptoms of chlorotic or necrotic spots, chlorosis and necrosis. The samples were tested by enzyme-linked immunosorbent assay using TYFRV-specific antibodies. Among those tested, 498 samples (25.4%) were found to be infected with the virus. The virus was detected in 72.4% of the potato fields in all provinces surveyed. Thirteen potato isolates of TYFRV were selected for further biological and molecular studies. Based on their reactions on Nicotiana tabacum plants, the isolates were separated into two groups, namely L (local infection) and N (systemic infection). The nucleotide sequences of the nucleoprotein (N) genes of the isolates were determined and compared with the homologous sequences in Genbank. No recombination evidence was found in the isolates using different recombination-detecting programs. In the phylogenetic tree, the potato isolates fell into two major groups: IRN-1 and IRN-2 corresponding to the two biologically separated groups. This study shows for the first time the biological and phylogenetic relationships of geographically distant TYFRV isolates from potatoes in the mid-Eurasian country of Iran.
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Reza Pourrahim,Alireza Golnaraghi,Shirin Farzadfar,Kazusato Ohshima 한국식물병리학회 2012 Plant Pathology Journal Vol.28 No.4
Eight potato-producing provinces of Iran were surveyed during the growing seasons of 2004−2006 to detect the presence of Tomato yellow fruit ring virus (TYFRV),a tentative species in the genus Tospovirus. A total of 1,957 potato leaf samples were collected from plants with tospovirus-like symptoms of chlorotic or necrotic spots, chlorosis and necrosis. The samples were tested by enzyme-linked immunosorbent assay using TYFRVspecific antibodies. Among those tested, 498 samples (25.4%) were found to be infected with the virus. The virus was detected in 72.4% of the potato fields in all provinces surveyed. Thirteen potato isolates of TYFRV were selected for further biological and molecular studies. Based on their reactions on Nicotiana tabacum plants, the isolates were separated into two groups,namely L (local infection) and N (systemic infection). The nucleotide sequences of the nucleoprotein (N) genes of the isolates were determined and compared with the homologous sequences in Genbank. No recombination evidence was found in the isolates using different recombination-detecting programs. In the phylogenetic tree, the potato isolates fell into two major groups: IRN-1 and IRN-2 corresponding to the two biologically separated groups. This study shows for the first time the biological and phylogenetic relationships of geographically distant TYFRV isolates from potatoes in the mid-Eurasian country of Iran.
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